A pickaxe so cold that it freezes anything on contact!
Right click lava or water to solidify them! (lava turns into obsidian and water turns into ice).
This pickaxe is too fragile to mine anything other than ice. But it will drop the ice block as if the pickaxe was enchanted with silk touch.
You can also repair the pickaxe on an anvil with ice blocks. It will also repair itself if you stand in a biome cold enough!
But if you go into the nether, a desert or a jungle it will damage from the heat!
Typical vanilla pickaxe recipe. With ice blocks and sticks, like this: